Expansion bar



EXPANS ION BAR June 19,'1928.

F. LEOPOLD, JR., ET AL edafzdleopald, Jr.

ollin Jeeson June 19, 1928.

F. LEOPOLD, JR., ET AL.

EXPANS ION BAR attenua* Filed July 10, 1926 Patented June 19, 1928 Y Umran- STATES.

1,673,87 P'reur ePrice,

FREDERICK LEOPOLD'. Ia., eFHnRM'onv'iLLn; Ann RQLLIN .inrrnaso'n 'nrivrniinl'rg or" ooi'yisrioHo'oKEN, PENNSYLVnIA, Assireiions fromm" :anaemia Tran ooRPoRA-f "rroN, oFooNsHoHooKEN, PENNsYrvAma, eea-roi arroi\if errnNrisvnvlxitra.`

EXPANSION BAR.

Alpplicaton filed Julyi 10,

Q @ur invention -relatestonevvanduseful Improvements in expansion bai'sand more particularly to expansion bars that Aare adapted for expanding and gripping paper shellsi4 fabric rolls, cores,` or in' fact any articlein the form ofa roll or bolt thathas a hollow center, in which a` bar or shaft of this type may be inserted. f

vOneof the objeetsot theV present inventioniis toprovide an.v expansion bar or shaft, which consists of a core, and aiplurality of longitudinally extendingkeys, and the parts so arranged that Wheni the keysare mOved forwardly, they also move radially to grip Whateven is aboutvr the saidbar.

Still another object ofi the invention is to provide a bar with a small revolviabler head that is connected with radially expanding keys so that a rotation of the headeither expands or. contiaots thev keys, depending, on tlie direction ini Whichf thehead-.is revolved.

Still anotlien objectof the invention is to provide: ani expansions bar with a` sleeve or collar just beyond the head,.so` that the bar maybe readily held iii` an'aligned position when it is desired to rotatefthe material andtliebar. o V p Still another obj eet of.; the invention isA to provide aniexpansion baroonsisting: of` but few parts Which may be readily assembled andreadily operated when so assembled.

'Vitlrtliess and other objects n.view,-the invention consists incertaiirnew and novel arrangements and `combination of parts as Will beshereinafter more fully described and 4pointed out intheelaim. i i

Referring now to the drawings, showing ai preferred embodiment of our invention,

Fig. l is a sectional View taken throughout the bar'and to` pass "through two' ofthe keys iii'tlieir normal oreontiaoted position. f Fig. Qris aisimilar View, but with thenhead moved forwardly andthe keysin their radially expanded position; K

Fig.' 3ds a side elevation of the endrof the block in which the core is` threaded and pinned'. p

Fig. 4 isA an end-'view ofthe same. y

Fig. 5 is a section takenlon line'-of Fig;` l, the seotionbeing slightly irregular to "show the three keys and` key Waysv or grooves. y

Fig; 6' is a'` view in detail of the core, tivo ofthe keys andfasplit ring:

i926. serial No. 121,722?.

Fig. 7 is a? sectional View similar topFig.` 5 and taken on line 7 7 ofFig. 1.

Y F ig. 8 is a similar View taken on line 8-8 of Fig. 2. i

Fig. 9 is a similar" sectional .View on line9-9of Fig. 1,-and

` Fig. l() is a perspective, of two of the kevs showing their. relative position to each other that they will assume when `inthe core.

Referring now more particularly to the several views, we have shown the preferred type or foi-in of` expansion bar as consisting' of a core? l externally threaded atl its one endas at 2; while extendingnearly through outthe length of this core-.are the three slots ,taken or grooves 3',fo'r the purpose' of holdingthe gripping keys which will be plained.

'shortly ex- This Corelv `is preferably made ofucircular steel'stook and when the grooves are formed, lengthwiselofi the bai',` andfat differenti points aroundi its periphery; the bottom of the groovesar'efeuti or fashionedi with the raised portions Il.' and' intermediate valleys 5as may be clearly seen in the. several4 views, especially in Fig. 6.

Near the outer endof the core l there is out a1 oireiuii-ferential slot' V(3,.While afuitlier similar` slot 7 isslio'wn near theopposite `end of lthe core, both of Whioli slots receive split .rings aswill be shortly mentioned.y

Formed on the corel and! adjacent the threadedend,4 is the ciroulargintegral sleeve S,as may be seenin-Fig. (Liso lthat oni this sleeve may be plated-` a bushing. or housing QS to support thebar asa Wliole'iin' position When-assembled. Y

Referring no'wto `the several keys 9,@ and inasmuch as they are all alikeya description of one will bea descriptionofall.. As may be seen in Figs. 6 .and 10,-each keyconsists preferably of a steell bar, the upper-and lower edges of Whicliiare both irregular, the

upper edgebeing slotte-dito receive the split i,

rings and i-t Within the support' Qfufliile the lower surface isvprovided with an `ind`entation or a valley 10 about midway of its length andthe one endis reduced asjati 11,

thereby leaving the ridge or projection- 2,

as may beseen in"tlie several; viewsfnAs heretofore mentioned, theiipper ed-eftlie bai is provided with?l slotsor out out" por-- tions, one being shown* as'at l3,and`fin1a like manner, at 114. In making 4tlielasr, inen-v P, fi

f lll tioned cut. however, a small lug 1.5 is lett standing, thus 'lorii'iing a small indentation between the lug and the shoulder 1G. 'lhe one end ot the key is provided with a short stub or toot. 17 which extends into the means` for advancing the keys as will he shortly mentioned.r These three keys are then placed within thc slots or grooves 3, and in their normal position they will nest within the grooves ot the core, as the several ridges will project within the valleys 1t), and the e3;- pansion har will of course he in its nornial or contracted position.

For holding the keys within the groove. there are shown two split rings 1S. which are placed aboutv the hereto-tore mentioned slots t' and 7 ot' thev core, and ahout the slots lormed in the keys, and as the keys expand` (move radially) ot course, the rings will open only to retract again when the keys are contracted.

eterring now to the nut or head 19, which is the means t'or advancing and reti-acting the keys 9 within the slot, and. which action radially expands or contracts the keys, it will he seen that this head is internally hored and threaded as at Q0, while a small chamber 21 is formed in one face thereot over which face there is shown a plate which in turn is held in position by the screws 23. This plate is also internally or centrally bored, and fitting within this chainber, as may he seen in Fig. 1, are the inner ends of the stubs or feet 17 of the keys, after which the plate is locked in position, thus securing the keys with relation to the head.

The diameter of the chamber and the diarneter of the opening within the plate Q2 is such, however, that when the keys are moved forwardly from the position shown in Fig.

1, to the position shown in Fig. 2, the feet orv inner end ot the keys may expand or move outwardly to the edge ot this chainher.

Referring now to Figs. l and we have shown the threaded end 2 ot the core 1 extending within a block :2st, over which hlock there is placed a collar while a key 26 is shown as passing through the collar hlock and core 1 for holding the core from revolving with relation to the hlock and collar.

Fitted within the periphery ot the nut or head 19 are the little knurled handles QT that are to he gripped when it desired to revolve the head on the cole 1 to move the keys forwardly and rearwardly.

About the sleeve 8, there is shown a hushing 28, provided with a flange 29, which flange may he fastened to a wall, partition, or other means to support or hold the expansible har when the same is in use.

It might here he mentioned that the hloek 24 and core 1 must he held against rotation when it is desired to move the keys hy rotating the head 19 hut after an article has heen gripped on the expansion har. the har may he held in any manner so that it may revolve as a whole and act as a shal't tor the article that; is held on the har.

Referring now to the manner ot operating the har, it will he seen that it is only necessary to revolve the head 19 in a forward direction, the hlock 24 with the core l, ot course, heing held against rotation. r1`his turning ot the head on the core will cause the three keys to move forwardly and will Vi'orce the ridges ot the keys upon the ridges 'formed in the bottom of the grooves and the keys will then expand radially and assume the positions illustrated in Fig. 2, the cX- panding ot these keys thus holding any shell or core (within certain diameters) that have heen placed on the expansion har. '.lhe article will he held until the head is revolved again in a reverse direction when the keys, ot course, will again nestle tightly within the grooves ot the core. The tension ol' the split ring will hold the parts tightly together, and oli course, will prevent the keys l'roin dropping out ot the several grooves.

lt will be understood that although wc have shown three keys, a greater or lesser number might be used, although we have found that three keys arranged as shown are sullicient. y

It will also be understood that we have not shown the supports or bearings :tor the opposite ends ot the expansion bar, but these will he arranged to suit the different conditions, it being understood that it is necessary that the block 24 be held against movement when it is desired to rotate the head to manipulate the keys and at all other times the expansion har and head may rcvolve in its entirety without in any way expanding or contracting the keys.

In the drawings we have shown the cxpansion har as relatively short in length. but it .is to he understood that it may he o1 any length desired, it being only necessary to provide a longer core and longer keys, both of the parts, of course, being provided with the necessary ridges and valleys to radially expand the keys as they are moved in the COI'Q.

will serve the purpose Vt'or which they are intended; are easily expanded and contracted, and call for little repairs or adjustments.

Many slight changes n'iight he made without in any way departing from the spirit and scope of the invention.

Having thus described our invention, what we claim as new and desire to secure hy Letters Patent is:

An expansion bar comprising a rod in the form of a core having one end externally threaded, a hlock, said core threaded within said hlock `and pinned to the saine, a

l 'We have tound in actual use that the hars llt) lUll

head internally threaded on said threaded portion of the core and adapted to move forwardly and rearwardly on said core, the said Core provided With a plurality of longitudinally extending grooves or keyvvays, and a plurality of ridges formed in the bottom surfaces of said grooves, a plurality of keys having uneven `bottom edges and having their one ends mounted in said revolvable head, means encircling the keys and core :'or

in holding the keys Within said groove, means 

